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Old 07-20-2011, 02:18 PM   #1
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Join Date: May 2011
Location: North East, Alabama
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TJ running hot

I have a 1998 TJ, 4.0, automatic; recently I had an issue with it running hot. The water pump was bad and so was the fan clutch. I replaced the pump and clutch along with flushing the radiator. For the most part that fixed my problem. Driving down the road it does great but if turn on my a/c it runs the temp gauge up. I have since replaced the thermostat and temp sensor with no improvement noted. Is there anything else can try before replacing the radiator? I did burp the system after refilling with antifreeze.

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Old 07-20-2011, 08:30 PM   #2
OIA
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Have you changed out the radiator cap?

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Old 07-20-2011, 08:38 PM   #3
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If the radiator isn't boiling over from underneath the radiator cap, I doubt it needs a new radiator cap. But if you decide to replace it, make sure to get an 18 lb. model.

You flushed the radiator but did you check it with a flashlight inside underneath the radiator cap to see if it is clogged up any with hard water/mineral deposits? Has it tap water ever been added to the radiator when mixing up the coolant? Tap water can cause the radiator to clog up with disolved minerals, only distilled water should ever be added to a radiator (or the battery).
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Old 07-21-2011, 04:42 PM   #4
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I did repalce the cap, I forgot to mention it on the list.

I did look in there with a flashlight but could not tell much as far as it being clogged....It does have an orange-rust tint to the inside of the radiator as seen with iron ore water. I havent' had the jeep long so I dunno what the previous owner put in it but I put distilled in it this last time I changed it.
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